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David - I know what you're talking about. However, this isn't the same thing. When the set is on but there is no signal input (ie cable is off but set is on) I can hear that tone as soon as I walk into my house (however, nobody else in my house seems to hear it).
The tone I'm speaking of actually occurs while the set is on and there is an active input signal (my wife and kids can hear this tone too). The signal itself (DVD, VCR, Digital Cable) doesn't appear to influence the tone as it has happened using all inputs from time to time.
It's almost like once the set reaches a certain temperature it will begin to emit this high pitched tone. Again, I've had this set for about two years (use it all the time) and it only started doing this about a month ago.
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